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List:       fedora-test-list
Subject:    Re: F24 - gnome3 - hidpi any better?
From:       drago01 <drago01 () gmail ! com>
Date:       2016-05-21 7:17:26
Message-ID: CAMqY-FegfAX7QdsgR93Lnq7zE0d5Lik2-Zw6fgK3U6=k14DRgw () mail ! gmail ! com
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On Fri, May 20, 2016 at 11:13 PM, Adam Williamson
<adamwill@fedoraproject.org> wrote:
> On Tue, 2016-05-10 at 17:37 +0200, Jaroslav Reznik wrote:
>> On Tue, May 10, 2016 at 4:53 PM, Nikos Roussos <comzeradd@fedoraproject.org>
>> wrote:
>>
>> > On 05/10/2016 03:12 PM, Ankur Sinha wrote:
>> > > Hi,
>> > >
>> > > I just had an email from someone that installed F23 on a box with an
>> > > hidpi screen. Apparently, even using the window scaling etc doesn't
>> > > quite "make it look OK" - has anyone tried F24 with one of these
>> > > screens? Is it any better?
>> > >
>> > > (All I've found are multiple posts suggesting tweak-tool and then a few
>> > > that crib about window scaling options being limited to whole numbers.)
>> >
>> > That's the most common complaint I also hear around hidpi support.
>> > Scaling window accepting only integers and not decimals makes it pretty
>> > much unusable.
>> >
>>
>> Yep, that makes GNOME practically unusable on semi-HDPI screens like Carbon
>> has - you have too small or too big everything. And the worst scenario is
>> when you mix it with FullHD external monitors (at least, this is fixed with
>> Wayland - somehow). Unfortunately Qt guys decided to follow integer only
>> approach (even it's internally implemented as floats) and the only sensible
>> fix is to set font DPI in KDE settings. Also Plasma scales pretty well then
>> and it's possible to find balance between too small on laptop and too big
>> on FullHD :).
>
> Well, the whole point of hidpi is that it's a clever short-cut hack: it
> *can't* use arbitrary scaling factors, because the way it 'scales' is
> simply to sub out the graphical assets.
>
> At scaling factor 2, where you'd normally see a 32x32 icon, it uses a
> 64x64 icon. And so on. It also does text scaling at the same scaling
> factor, and that's basically the entire thing.
>
> It can't do scaling factor 1.6 unless someone draws 51.2x51.2 pixel

There is no such thing as ".2 pixel" which is another reason non
integer scaling does not work. You'd have to round that up or down
resulting into blurriness.
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